WATCH ABOVE: Hawaiians and tourists woke up to a chilling alert today. It was an emergency warning about an incoming nuclear attack from North Korea. But as Robin Gill reports, it was all a huge mistake.

Accidental warnings appeared on cell phones, TV and radio in Hawaii early Saturday morning, which told people that a ballistic missile was headed toward the U.S. state, multiple people reported on Twitter.

On cell phones, the emergency alert read: “BALLISTIC MISSILE THREAT INBOUND TO HAWAII. SEEK IMMEDIATE SHELTER. THIS IS NOT A DRILL.”

People in Hawaii right now are receiving a “Ballistic Missile Threat” warning on their iPhones.

Colliar, who is in Hawaii on vacation, said tourists were warned immediately, about monthly statewide testing of Cold War-era nuclear attack warning sirens.

“We had been hearing since we got here about the alarms that they have,” she explained. “They’ve been telling everybody, ‘We’re using these sirens, we’re practising with these sirens. If you hear them — if you don’t have any prior alerts — it means that it’s just a drill.

How did a ballistic missile alert warning accidentally get sent out in Hawaii?

How did a ballistic missile alert warning accidentally get sent out in Hawaii?

The Federal Communications Commission said it was launching a “full investigation” into a false wireless emergency alert that a ballistic missile was headed for Hawaii, the chairman of the commission said.

The @FCC is launching a full investigation into the false emergency alert that was sent to residents of Hawaii.

This was my phone when I woke up just now. I'm in Honolulu, #Hawaii and my family is on the North Shore. They were hiding in the garage. My mom and sister were crying. It was a false alarm, but betting a lot of people are shaken. @KPRC2pic.twitter.com/m6EKxH3QqQ

Jamie Malapit, owner of a Honolulu hair salon, texted his clients that he was cancelling their appointments and was closing his shop for the day. He said he was still in bed when the phone started going off “like crazy.” He thought it was a tsunami warning at first.

“I woke up and saw missile warning and thought no way. I thought ‘No, this is not happening today’,” Malapit said.

He was still “a little freaked out” and feeling paranoid even after hearing it was a false alarm.

“I went from panic to semi panic and ‘Are we sure?'” he said.

WATCH: Global BC anchor Lynn Colliar, who was on vacation in Hawaii, describes her reaction and those around her as she got an accidental missile alert warning.

Richard Ing, a Honolulu attorney, was doing a construction project at home when his wife told him about the alert.

He dug his phone out and had confirmed he had the same alert. Attempts to find further information on the television or radio didn’t provide further information, but then he saw on Twitter that it was a false alarm.

While he was trying to confirm, his wife and children were preparing to evacuate in case they needed to move to safer ground.

North Korean president Kim Jong-un has threatened to unleash his country’s growing missile weapon capability against the U.S. territory of Guam or U.S. states, prompting U.S. President Donald Trump to threaten tough actions against Pyongyang.

Trump was briefed on Saturday after an official message was mistakenly sent to Hawaii residents’ mobile phones warning them of an imminent ballistic missile attack. “The President has been briefed on the state of Hawaii‘s emergency management exercise. This was purely a state exercise,” White House spokeswoman Lindsay Walters said.

Hawaii, a chain of islands in the Pacific Ocean, has a population of about 1.4 million people, according to the U.S. Census Bureau, and is home to the U.S. Pacific Command, the Navy’s Pacific Fleet and other elements of the American military.

In November, Hawaii said it would resume monthly statewide testing of Cold War-era nuclear attack warning sirens for the first time in at least a quarter-century, in preparation for a possible missile strike from North Korea, state officials said at the time.